1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31/*
32 * trimvertex.h
33 *
34 */
35
36#ifndef __glutrimvertex_h_
37#define __glutrimvertex_h_
38
39#include "types.h"
40
41/*#define USE_OPTTT*/
42
43class TrimVertex { /* a vertex on a trim curve */
44public:
45    REAL		param[2];	/* parametric space coords */
46#ifdef USE_OPTTT
47    REAL                cache_point[4]; //only when USE_OPTTT is on in slicer.c++
48    REAL                cache_normal[3];
49#endif
50    long		nuid;
51};
52
53typedef class TrimVertex *TrimVertex_p;
54
55inline REAL
56det3( TrimVertex *a, TrimVertex *b, TrimVertex *c )
57{
58    return a->param[0] * (b->param[1]-c->param[1]) +
59	   b->param[0] * (c->param[1]-a->param[1]) +
60	   c->param[0] * (a->param[1]-b->param[1]);
61}
62
63#endif /* __glutrimvertex_h_ */
64